{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{6}{c}}
\toprule
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}&\multicolumn{1}{c}{(5)}&\multicolumn{1}{c}{(6)}\\
                    &\multicolumn{1}{c}{OLS\_ALL}&\multicolumn{1}{c}{OLS\_BIG}&\multicolumn{1}{c}{BTW\_ALL}&\multicolumn{1}{c}{BTW\_BIG}&\multicolumn{1}{c}{POLS\_ALL}&\multicolumn{1}{c}{POLS\_BIG}\\
\midrule
Income              &      -0.736         &      -0.357         &      -0.432         &      -0.518\sym{**} &      -0.447         &      -0.529\sym{**} \\
                    &     (0.382)         &     (0.204)         &     (0.356)         &     (0.184)         &     (0.334)         &     (0.173)         \\
\addlinespace
Constant            &       11.28         &       3.230         &       0.229         &       7.089         &       1.906         &       8.348         \\
                    &     (10.28)         &     (5.393)         &     (8.725)         &     (4.930)         &     (9.187)         &     (5.006)         \\
\addlinespace
Time effects        &          No         &          No         &          No         &          No         &         Yes         &         Yes         \\
\midrule
N                   &          43         &          26         &         645         &         390         &         645         &         390         \\
R2                  &       0.166         &       0.068         &       0.064         &       0.167         &       0.069         &       0.183         \\
\bottomrule
\end{tabular}
}
